how to use the fchmod function from the fs-extra library in typescript

To use the fchmod function from the fs-extra library in TypeScript, you'll first need to import both fs and fs-extra:

index.ts
import * as fs from 'fs';
import * as fse from 'fs-extra';
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Then, you can call the fchmod function like this:

index.ts
const path = '/path/to/file';
const mode = 0o777;

fse.fchmod(fs.openSync(path, 'r+'), mode, (err) => {
  if (err) {
    console.error(err);
  }
});
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In the example above, path is the path to the file you want to change the permissions for, and mode is the new permissions you want to set. The openSync function from fs is used to obtain a file descriptor for the file, which is used by the fchmod function from fs-extra. The (err) => {} callback function is called after the permissions have been changed and is used to handle any errors that may have occurred during the process.

Note that the fchmod function requires write access to the file, so you'll need to use a file descriptor obtained with the 'r+' flag, which allows both reading and writing. Additionally, the new permissions should be specified as an octal number.